Rolf wrote:
> Please correct me id I am wrong, but, with a 5v supply for the LED's,
> won't most of the battery power be going to the current limiting
> resistors rather than the LED's

Right, which is why 5V is a bad choice for the LED supply.  It should be
possible to arrange for switches that don't drop more than 100mV.  You want
some voltage accross a resistor to keep the current somewhat predictable and
consistent.  500mV is probably a good tradeoff between efficiency and
predictable and repeatable current.  Let's say the LEDs drop about 2.5V when
pulsed at high current, so you want the LED supply to be about 3V or a
little more.


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